The moodle-form-checkboxcontroller module has already been replaced in most of Moodle by the core/checkbox-toggleall ESM.

We should be able to replace the current usage here with that ESM.

This is currently only used in the formslib so no need to deprecate the old code (it's not a public API).

We just need to create a bridging ESM between the specific formslib implementation and the checkbox-toggleall module.